In the 1960s, IBM distributed a 'beta' Fortran compiler. Fortan numbered the lines and the error listing was at the bottom i.e.; "Syntax error in line 12" or "Undefined variable in line 23". One version listed all the errors, then stated "Note: there is an error in the error message numbering."

What happens if there's an error on the error pages error page?? I think you can see where i'm going with this... :o)

Nice to see that Google can still make fun of itself - i'd like to slip some of these 'easter eggs' into our web app but i'm not sure if the company would approve of it (although in a pre-release build we made all of our legal links go to a rick-roll... good times)

This reminds me of a Placeware (now Microsoft Live Meeting) error message from years ago. If you attempted to schedule a meeting with attendees: 1 you got a pop up message that stated (it's been so long I'm probably paraphrasing): Please select at least 2 attendees because meetings with only 1 person are not very fun.

Relating back to that post about the YouTube error message, I recall that dealing with the problem correctly gets you a message that says something along the lines of "Thank you, the monkeys are happy with their bananas"

Also, I've recently received error mail messages in gmail. They're emails that are from noreply@google.com and they just say "--error--" in the title and "--error--" in the body.